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Mitsubishi Electric ADVANCE Vol.84 VOL. 84/SEP. 1998 Mobile Communications Edition MITSUBISHI ELECTRIC A Quarterly Survey of New Products, Systems, and Technology ●Vol. 84/Sep. 1998 Mitsubishi Electric ADVANCE Our cover photographs show the GSM-type MT-30 digital mobile telephone. This light- weight (170g) and compact (135 x 48 x 26mm) unit provides up to two hours of continuous conversation and 120 hours in standby mode using standard batteries, performance that Mobile Communications Edition puts it in the top class worldwide. CONTENTS Editor-in-Chief Shin Suzuki TECHNICAL REPORTS Editorial Advisors Jozo Nagata OVERVIEW Toshimasa Uji The Present and Future Trends of Mobile Communications ................... 1 Keisuke Ueki by Michio Nakanishi Masakazu Okuyama Yasuo Kobayashi The Development of Digital Mova D203 Hyper ......................................... 2 Masao Hataya by Tetsuaki Oga and Shin?ichi Fukui Toshiharu Nozawa Seiya Inoue GSM and PCS1900 Digital Cellular Phones............................................... 4 Takashi Nagamine by Takayuki Nonami Hiroaki Kawachi Development of Model MT151 Mobile AccessTM Phone ........................... 7 Akihiko Naito by Kiyoshi Takahashi and Akira Matsumoto Kouji Ishikawa Shingo Maeda A W-CDMA Modem for Mobile Toshikazu Saita Next-Generation Communication Systems............................................... 9 Akira Inokuma by Takahisa Aoyagi and Hideshi Murai Vol. 84 Feature Articles Editor Viterbi Equalization Technologies for Mobile Broadband Systems ............................................................... 12 Tadashi Fujino by Hiroshi Kubo and Keishi Murakami Editorial Inquiries An Improved Differential Detection Scheme Masakazu Okuyama Based on Maximum Likelihood Sequence Estimation ........................... 14 Corporate Total Productivity Management by Toshiharu Kojima and Makoto Miyake & Environmental Programs Low Bit-Rate Speed Coding Technology ................................................ 17 Mitsubishi Electric Corporation by HirohisaTasaki and Shin?ya Takahashi 2-2-3 Marunouchi Chiyoda-ku, Tokyo 100-8310, Japan Fax 03-3218-2465 SPECIAL REPORT Recent Topics in the ITU-R Relating to Product Inquiries Mobile Radio Communications ................................................................ 20 by Masayoshi Murotani Yasuhiko Kase Global Strategic Planning Dept. Corporate Marketing Group MITSUBISHI ELECTRIC OVERSEAS NETWORK Mitsubishi Electric Corporation 2-2-3 Marunouchi Chiyoda-ku, Tokyo 100-8310, Japan Fax 03-3218-3455 Orders: Four issues: ¥6,000 (postage and tax not included) Ohm-sha Co., Ltd. 1 Kanda Nishiki-cho 3-chome Chiyoda-ku, Tokyo 101-0054, Japan Mitsubishi Electric Advance is published quarterly (in March, June, September, and December) by Mitsubishi Electric Corporation. Copyright © 1998 by Mitsubishi Electric Corporation; all rights reserved. Printed in Japan. TECHNICAL REPORTS Overview The Present and Future Trends of Mobile Communications by Michio Nakanishi* The systems responsible for mobile communications are increasingly adopting digital technologies, and expectations are rising for the move from voice communications to multimedia communications. Public systems prom- ise to experience enormous demand, a trend supported by increases in living space and the diversification of economic activities. The eager acceptance given to the immediacy and simplicity of mobile communication has resulted in its adoption by users in many different age groups, and it is increasingly important for information communications. By the end of 1997, some 204 million sub- scribers in more than 100 countries were using mobile telephones. In Japan, mobile telephones including the PHS system had attracted more than 37.6 million subscribers by February, 1998, rapidly approaching the high levels of penetration in the Scandinavian nations. Investigations of and research into mobile telephone systems are underway in many nations, seeking to identify those that will provide more effective means of coping with large numbers of subscribers than the current implementations of cellular phones using GSM, PDC, D-AMPS, etc., and mobile phones using CDMA, etc., already in use in the U.S.A. Among these is the next-generation IMT-2000 (FPLMTS) communications system, which is being prepared for implementation in the year 2000 in Japan, Europe and the U.S.A. Studies of this next-generation system are concentrating on unified national standards that will enable a single handset to function with universal compatibility while at the same time handling multimedia communications. Research is also under way into links between next-generation high-speed radio communications access systems and mobile satellite communications systems. On the other hand, mobile business commu- nications in Japan are about to go over to digital technologies and to progress from voice to multimedia communications. ❑ *Michio Nakanishi is a Director, Communication Systems Group. September 98 · 1 TECHNICAL REPORTS The Development of Digital Mova D203 Hyper by Tetsuaki Oga and Shin’ichi Fukui* Mitsubishi Electric’s easy-to-use Model D203 digital cellular phone is an 800MHz PDC type that features a compact lightweight design, extended battery standby and operating time, and the ability to display text messages (using the Short Message Service) on a four line by ten character LCD panel with electroluminescent lighting for nighttime use. In 1996, Japan had nearly 21 million digital cell phone users, and the market is continuing to grow. In June 1997, Mitsubishi Electric launched Model D203, developed under the guidance of NTT Mobile Communications Corporation for the company’s 800MHz PDC digital phone service. The cell phone boasts several user-friendly fea- tures. Extensive measures to lower power dissi- pation have extended the battery operating time to 90 minutes of continuous speech and 200 hours on standby with a standard battery, or 190 min- utes of speech and 420 hours on standby with an L-size battery. Incoming calls can be signaled by an audible ring tone or a silent vibrator, permit- ting discreet use, while the flip-open handset need not be open to answer calls, simplifying opera- tion and enhancing reliability. Model D203 sup- Fig. 1 Model D203 digital cellular telephone. ports Japan’s short mail service, available since June 1997, displaying messages on a four-line by ten-character screen. A bright electroluminescent backlight illuminates the screen for nighttime use. The product is available in cosmic blue and Table 1 Specifications glossy gray finishes. Fig. 1 shows a photograph of Battery type S L Dimensions the Model D203. 123 x 40 x 26mm 123 x 40 x 38mm (LxWxD) Specifications Weight 120g 155g Table 1 lists the specifications and Fig. 2 shows Battery type Lithium ion a circuit block diagram. The unit measures Nominal operating 3.6V 123mm high, 40mm wide and 26mm thick and voltage weighs 120g with a standard battery—light- Nominal capacity 600mAh 1,300mAh weight and convenient for handheld operation. The L-size battery, which extends the opera- Charging time 80min 190min tion and standby time, increases the width to Transmit power 0.8W 38mm and the weight to 155g. The flip-open Frequency band 800MHz case was designed to protect the keypad from Talk time (max. power, full rate impacts and accidental operation. 90min 190min speech coding, "off" power saver mode) Transmitter Circuit The I.Q. generator converts serial binary data Standby time 200h 420h *Tetsuaki Oga and Shin’ichi Fukui are with the Mobile Communication Business Division. 2 · Mitsubishi Electric ADVANCE TECHNICAL REPORTS RF BLOCK CONTROL BLOCK TRANSMITTER BLOCK Control signals Transmit/receive IQ GENERATOR BLOCK antenna Transmit power controller allel I ter RF generator and Quadrature Data er power amplifier Q v modulator erential ial-par coding Audio Audio con Diff Nyquist filter processor Ser codec Transmit/receive Microphone switch Synthesizer Receive Micro- Keypad and antenna processor LCD display First IF circuit Second IF circuit Memory Low noise First local IF Second local Mixer Mixer Demodulator amplifier oscillator IF oscillator Power supply Filter TDMA processing, baseband processing (SAW filter) RECEIVER BLOCK Fig. 2 Block diagram. from a microprocessor in the logical control switches and phase-locked loops. block to parallel data which is then differential coded and passed through a bandwidth-limit- Logical Control Block ing Nyquist filter in preparation for π/4 quadra- This section controls the RF block, processes ture phase shift keying (QPSK) modulation. The signals to and from the base station, performs filter has a root Nyquist roll-off ratio of 0.5 that connection management, decodes keyboard limits the width of the passband. The quadra- inputs, manages the LCD panel, serves as a ture modulator performs direct quadrature speech codec, performs audio passband filter- modulation of the local transmission signal ing and volume control, and manages the con- from the frequency synthesizer, which simpli- nection with a fax-modem adapter. The M30600 fies the circuitry and reduces the component series microprocessor, a monolithic device with count. a 16-bit data path, is used as the processor. Flash A compact two-stage GaAs amplifier has been memory holds the firmware. SRAM and used in the RF block, providing efficient, gen- EEPROM are also used. eral-purpose amplification. Dual FETs are used to implement power control in six, 4dB steps. Display The LCD panel features a space-saving inte- Receiver Circuit grated driver circuit that is fabricated directly
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